Gun lock



FIG. 1 is a perspective view of a gun lock showing my new design;

FIG. 2 is a top plan view thereof; it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 3 is a right side elevation view thereof; the left side being a mirror image; it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 4 is a bottom plan view thereof; it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a gun lock, as shown and described. 